Chapter 1 WP1: Fish species and vulnerable populations
1.1 Background
In the fish WP, we will identify relevant and target species within each watercourse. This will be done by the combination of information from the electro fishing database (SERS), the test fishing database (NORS), as well as the Species observation system database (Artportalen), all available at SLU. In addition, the County Boards will be consulted about the fish fauna in their respective counties. When a comprehensive understanding about the fish fauna in the different watercourses has been produced, additional information about vulnerability of different species/populations will be added as an additional datasheet. The vulnerability assessment will largely be based on the Swedish Red list and County Board information about vulnerable populations including occurrence of freshwater pearl pussel. In addition, information about protected and valuable areas (Natura 2000, Nyckelbiotoper) will contribute to the overall assessment of vulnerability.
1.2 Fish occurrences from NORS and SERS
Fish species occurrence in rivers and lakes was acquired from the API for databases SERS (electrofishing registry) and NORS (lake fishing registry) available at SLU (https://dvfisk.slu.se/home).
1.2.1 NORS
The data files contains for each sampled lake/river summaries of which fish species are caught, the first and last sampling year, how many times it has been sampled, CPUE, the most common caught species, and more. The database contains 4176 sampled lakes. A map of all sampled lakes (and the species which are caught) can be found below.
Map 1 A map of all the lake fishing sites in Sweden. There are 4183 sampled locations. The size of the point is proportional to the number of species caught. Click on the point to get the species list (in Swedish) and the name of the water body.
1.2.2 SERS
Map 2 A map of all the electrofishing sites in Sweden. There are 23326 sampled locations. The size of the point is proportional to the number of species caught. Click on the point to get the species list (in Swedish) and the name of the water body.
1.2.3 Both databases combined
It is possible to do sub-selections of this data if we need to extract the distribution of particular species, both for problem species (e.g., invasive) or redlisted species.
Map 3. Map with both SERS (orange) and NORS (blue) combined. The size of the point is proportional to the number of species caught. Click on the point to get the database origin, the species list (in Swedish), and the name of the water body.
1.3 Redlisted species
A map of the occurrences of the redlisted species with data from both SERS and NORS:
- aspen (asp)
- alpine bullhead (bergsimpa)
- burbot (lake)
- European eel (ål)
- sea lamprey (havsnejonöga)
- Wels catfish (mal)
- vimba bream (vimma)
1.4 Freshwater pearl mussel
The endangered freshwater pearl mussel is often regarded as an indicator, keystone and umbrella species. It is present in nutrient-poor, cold, and clear rivers. It has been subject to pearl fishing but it is not so common anymore. It has a parasitic stage that involves the brown trout and/or Atlantic salmon as host species to complete its life cycle. There are about 650 populations in Sweden depending on what one assess to be an “individual population”. About half of the populations in Sweden lack recruitment, that is, during inventory of the populations, no mussels smaller than 50 mm were found. It is generally said that mussels reach around 50 mm when they are 20 years old. If there are no small (young) mussels present in the population, something is disturbing the recruitment process, either in the host species or the mussels, or both.
The exact locations of populations is sensitive data because the freshwater pearl mussel have been subject to pearl fishing. To protect the populations we will only present the river section where they occur instead of the exact locations.
1.5 Connecting point data to river lines
(I have been talking about this earlier, points are just points and has to be translated to the “river dimension”. However, the interactive map function (called leaflet) used above is very slow when handling the large river network. Therefore we have to go with the approach of static maps.)
NEW RIVER LINE DATA AVAILABLE FROM LANTMÄTERIET! Hydrografi i nätverk
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